MIDDLE STATIC PRESSURE DUCT TYPE AIR CONDITIONER Installation Manual Middle Static Pressure Duct Type KTI-18HWF 32 KTI-55HWF 32 IMPORTANT NOTE: Read this manual carefully before installing or operating your new air conditioning unit. Make sure to save this manual for future reference.
Table of Contents Installation Manual 1 Accessories... 04 2 Safety Precautions... 05 3 Installation Overview 07... 4 Indoor Unit Indoor Unit Installation...... 08 Installation a. Indoor Unit Parts... 08 b. Indoor Unit Installation Instructions... 08 5 Outdoor Unit Installation... 13 a. Outdoor Unit Installation Instructions... 13 b. Outdoor Unit Types and Specifications... 14 c. Notes on Drilling Hole in Wall... 15 6 Drainpipe Installation... 16 07
7 Refrigerant Piping Connection... 18 A. Notes on Pipe Length and Elevation... 18 B. Refrigerant Piping Connection Instructions...20 L N 8 Wiring... a. Outdoor Unit Wiring... b. Indoor Unit Wiring... c. Power Specifications... 9 Air Evacuation... a. Evacuation Instructions... b. Note on Adding Refrigerant... 27 MC 22 22 23 25 MC 27 28 10 Test Run... 29 11 European Disposal Guidelines... 30 12 Information Servicing... 31 C au t i o n: Risk of fire (R32/R290 refrigerant ) Page 3
1 Accessories The air conditioning system comes with the following accessories. Use all of the installation parts and accessories to install the air conditioner. Improper installation may result in water leakage, electrical shock and fire, or equipment failure. NAME Tubing & Fittings Drainpipe Fittings (for cooling & heating) EMC Magnetic Ring (some models) SHAPE QUANTITY Soundproof / insulation sheath 2 Seal sponge (some models) 1 Orifice (some models) 1 Drain joint (some models) 1 Seal ring (some models) 1 Magnetic ring (wrap the electric wires S1 & S2 ( P & Q & E ) around the magnetic ring twice) 1 S1&S2(P&Q&E) Magnetic ring (Hitch on the connective cable between the indoor unit and outdoor unit after installation.) 1 Owner s manual 1 Installation manual 1 Transfer connector(φ12.7-φ15.9)/ ( Φ0.5in-Φ0.63in )(Packed with the indoor unit ) NOTE: Pipe size may differ from appliance to appliance. To meet different pipe size requirements, sometimes the pipe connections need a transfer connector installed on the outdoor unit. Others Transfer connector(φ6.35-φ9.52)/ ( Φ0.25in-Φ0.375in )(Packed with the indoor unit) NOTE: Pipe size may differ from appliance to appliance. To meet different pipe size requirements, sometimes the pipe connections need a transfer connector installed on the outdoor unit. Transfer connector(φ9.52-φ12.7)/ ( Φ0.375in-Φ0.5in ) (Packed with the indoor unit, used for multi-type models only ) NOTE: Pipe size may differ from appliance to appliance. To meet different pipe size requirements, sometimes the pipe connections need a transfer connector installed on the outdoor unit. 1 (on some models) 1 (on some models) 1 (on some models) Connecting wire for display (2m) 1(on some models) Cord protection rubber ring 1(on some models) Optional accessories There are two types of remote controls: wired and wireless. Select a remote controller based on customer preferences and requirements and install in an appropriate place. Refer to catalogues and technical literature for guidance on selecting a suitable remote controller. Page 4
Safety Precautions 2 Read Safety Precautions Before Installation Incorrect installation due to ignoring instructions can cause serious damage or injury. The seriousness of potential damage or injuries is classified as either a WARNING or. WARNING Failure to observe a warning may result in death. The appliance must be installed in accordance with national regulations. Failure to observe a caution may result in injury or equipment damage. WARNING The appliance shall be stored in a room without continuously operating ignition sources (for example: open flames, an operating gas appliance or an operating electric heater). Do not pierce or burn. The appliance shall be stored so as to prevent mechanical damage from occurring. Be aware that the refrigerants may not contain an odour. Compliance with national gas regulations shall be observed. Keep ventilation openings clear of obstruction. A warning that the appliance shall be stored in a well-ventilated area where the room size corresponds to the room area as specified for operation. Any person who is involved with working on or breaking into a refrigerant circuit should hold a current valid certificate from an industry-accredited assessment authority, which authorises their competence to handle refrigerants safely in accordance with an industry recognised assessment specification. Servicing shall only be performed as recommended by the equipment manufacturer. Maintenance and repair requiring the assistance of other skilled personnel shall be carried out under the supervision of the person competent in the use of flammable refrigerants. Appliance shall be stored in a well-ventilated area where the room size corresponds to the room area as specified for operation. Appliance shall be stored in a room without continuously operating open flames (for example an operating gas appliance) and ignition sources (for example an operating electric heater). Appliance shall be installed, operated and stored in a room with a floor area larger than X m², installation of pipe-work shall be kept to a minimum X m²(please see the following form ). The appliance shall not be installed in an unventilated space, if that space is smaller than X m² (Please see the following form ).Spaces where refrigerant pipes shall be compliance with national gas regulations. The appliance shall be stored in a room without continuously operating ignition sources (for example: open flames, an operating gas appliance or an operating electric heater). Do not pierce or burn. The appliance shall be stored so as to prevent mechanical damage from occurring. Be aware that the refrigerants may not contain an odour. Compliance with national gas regulations shall be observed. Keep ventilation openings clear of obstruction. A warning that the appliance shall be stored in a well-ventilated area where the room size corresponds to the room area as specified for operation. Page 5
WARNING Any person who is involved with working on or breaking into a refrigerant circuit should hold a current valid certificate from an industry-accredited assessment authority, which authorises their competence to handle refrigerants safely in accordance with an industry recognised assessment specification. Servicing shall only be performed as recommended by the equipment manufacturer. Maintenance and repair requiring the assistance of other skilled personnel shall be carried out under the supervision of the person competent in the use of flammable refrigerants. Appliance shall be stored in a well-ventilated area where the room size corresponds to the room area as specified for operation. Appliance shall be stored in a room without continuously operating open flames (for example an operating gas appliance) and ignition sources (for example an operating electric heater). Appliance shall be installed, operated and stored in a room with a floor area larger than X m², installation of pipe-work shall be kept to a minimum X m²(please see the following form ). The appliance shall not be installed in an unventilated space, if that space is smaller than X m² (Please see the following form ).Spaces where refrigerant pipes shall be compliance with national gas regulations. Model (Btu/h) Amount of refrigerant to be charged (kg) maximum installation height (m) Minimum room area (m²) 30000 2.048 1.8m 4 30000-48000 2.048-3.0 1.8m 8 >48000 >3.0 1.8m 9 Note about Fluorinated Gasses 1. This air-conditioning unit contains fluorinated gasses. For specific information on the type of gas and the amount, please refer to the relevant label on the unit itself. 2. Installation, service, maintenance and repair of this unit must be performed by a certified technician. 3. Product uninstallation and recycling must be performed by a certified technician. 4. If the system has a leak-detection system installed, it must be checked for leaks at least every 12 months. 5. When the unit is checked for leaks, proper record-keeping of all checks is strongly recommended. Explanation of symbols displayed on the indoor unit or outdoor unia (applicable to the unit adopts R32/R290 Refrigerant only): WARNING This symbol shows that this appliance uses a flammable refrigerant. If the refrigerant is leaked and exposed to an external ignition source, there is a risk of fire. This symbol shows that the operation manual should be read carefully. This symbol shows that a service personnel should be handling this equipment with reference to the installation manual. Page 6 This symbol shows that information is available such as the operating manual or installation manual.
Overview 3 Installation Overview INSTALLATION ORDER 1 3 2 Install the indoor unit (Page 8) 6 Install the outdoor unit (Page 13) 5 MC Install the drainpipe (Page 16) 4 L N MC Evacuate the refrigeration system (Page 27) Connect the wires (Page 22) Connect the refrigerant pipes (Page 18) 7 Perform a test run (Page 29) Page 7
Indoor Unit Parts Air inlet Electric control cabinet Air filter(on some models) Drain hose Air outlet Fig. 4.1 Refrigerant connecting pipe Safety Precautions WARNING Securely install the indoor unit on a structure that can sustain its weight. If the structure is too weak, the unit may fall causing personal injury, unit and property damage or death. DO NOT install the indoor unit in the bathroom or laundry room as excessive moisture can short the unit and corrode the wiring. Indoor Unit Installation Instructions Step 1: Select installation location The indoor unit should be installed in a location that meets the following requirements: Enough room exists for installation and maintenance. Enough room exists for the connecting pipe and drainpipe. The ceiling is horizontal and its structure can sustain the weight of the indoor unit. The air inlet and outlet are not impeded. The airflow can fill the entire room. There is no direct radiation from heaters. Models with a cooling capacity of 9000Btu to 18000Btu only apply to one room. Maintenance roomage 20cm or more 30cm or more Install the indoor and outdoor units, cables and wires at least 1m (3.2 ) from televisions or radios to prevent static or image distortion. Depending on the appliances, a 1m (3.2 ) distance may not be sufficient. If the indoor unit is installed on a metal part of the building, it must be electrically grounded. DO NOT install the unit in the following locations: In areas with oil drilling or fracking In coastal areas with high salt content in the air In areas with caustic gases in the air, such as near hot springs In areas with power fluctuations, such as factories In enclosed spaces, such as cabinets In kitchens that use natural gas In areas with strong electromagnetic waves In areas that store flammable materials or gas 60cmX60cm checking orifice Page 8 In rooms with high humidity, such as bathrooms or laundry rooms Fig. 4.2 Unit Installation Indoor Unit Installation 4 Indoor Unit Installation
Step 2: Hang indoor unit. Indoor Unit Installation 1. Please refer to the following diagrams to locate the four positioning screw bolt holes on the ceiling. Be sure to mark the paces where you will drill ceiling hook holes. Air outlet dimensions Air inlet dimensions Air filter Descending ventilation opening and mounted hook Air filter Electric control box Fig. 4.3 Table.4-1 (unit: mm/inch) Outline dimension air outlet opening size air return opening size Size of mounted lug MODEL (Btu/h) A B C D 18K 880/34.6 210/8.3 674/26.5 600/23.6 136/5.4 706/27.8 190/7.5 782/30.8 920/36.2 508/20 24K 1100/43.3 249/9.8 774/30.5 700/27.6 175/6.9 926/36.5 228/8.9 1001/39.4 1140/44.9 598/23.5 30K~36K 1360/53.5 249/9.8 774/30.5 700/27.6 175/6.9 1186/46.7 228/8.9 1261/49.6 1400/55.1 598/23.5 36K~60K 1200/47.2 300/11.8 874/34.4 800/31.5 227/8.9 1044/41.1 280/11 1101/43.3 1240/48.8 697/27.4 E F G H I J Page 9
Wood Place the wood mounting across the roof beam, then install the hanging screw bolts.(see Fig.4.4) Indoor Unit Installation Wood mounting Roof beam Ceiling Hanging screw bolts Fig. 4.4 New concrete bricks Inlay or embed the screw bolts. (See Fig. 4.5) (Blade shape insertion) (Slide insertion) Fig. 4.5 Original concrete bricks 3. Install hanging screw bolts. Cut off the roof beam. Strengthen the point at which the cut was made. Consolidate the roof beam. 4. After you select an installation location,align the refrigerant pipes, drain pipes, as well as indoor and outdoor wires with their connection points before mounting the unit. 5. Drill 4 holes 10cm (4 ) deep at the ceiling hook positions in the internal ceiling. Be sure to hold the drill at a 90 angle to the ceiling. 6. Secure the bolt using the washers and nuts provided. 7. Install the four suspension bolts. 8. Mount the indoor unit with at least two people to lift and secure it. Insert suspension bolts into the unit s hanging holes. Fasten them using the washers and nuts provided. (See Fig. 4.8). Use an embedding screw bolt, crock, and stick harness. (See Fig.4.6) Steel bar Embedding screw bolt (Pipe hanging and embedding screw bolt) Fig. 4.6 Steel roof beam structure Install and use the supporting steel angle. (See Fig.4.7) Hanging screw bolt Hanging bolts Fig. 4.8 Supporting angle steel Fig. 4.7 The unit body must be completely aligned with the hole. Ensure that the unit and the hole are the same size before moving on. 2. Install and fit pipes and wires after you have finished installing the main body.when choosing where to start, determine the direction of the pipes to be drawn out. Especially in cases where there is a ceiling involved, align the refrigerant pipes, drain pipes, and indoor and outdoor lines with their connection points before mounting the unit. Page 10 9. Mount the indoor unit onto the hanging screw bolts with a block. Position the indoor unit flat using a level indicator to prevent leaks. (See Fig. 4.9). Shockproof cushion Washer Screw nut Overhang part Hanging screw bolt Fig. 4.9 NOTE: Confirm the minimum drain tilt is 1/100 or more.
Step 3: Duct and accessories installation Canvas tie-in Indoor Unit Installation 1. Install the filter (optional) according to the size of the air inlet. 2. Install the canvas tie-in between the body and duct. 3. The air inlet and air outlet duct should be far enough apart enough to a avoid air passage short-circuit. 4. Connect the duct according to the following diagram: Canvas tie-in Isolation booth Air outlet Air inlet Isolation booth checking orifice Air dust filter Fig. 4.10 5. Refer to the following static pressure guidelines when installing the indoor unit. Table.4-2 MODEL (Btu/h) Static Pressure (Pa) 18K 0~100 24K 0~160 30K~36K 0~160 42K~60K 0~160 Change the fan motor static pressure according to external duct static pressure. NOTE: 1. Do not place the connecting duct weight on the indoor unit. 2.When connecting the duct, use an nonflammable canvas tie-in to prevent vibrating. 3.Insulation foam must be wrapped outside the duct to avoid condensate. An internal duct underlayer can be added to reduce noise, if the end-user requires. Page 11
Step 4: Adjust the air inlet direction (From rear side to under-side.) Indoor Unit Installation 1. Take off the ventilation panel and flange. Step 5: Fresh air duct installation Dimension : Duct joint for fresh air Air return flange MODLE 18-60 Ø125mm(4.92 ) Ventilation panel Ø160mm(6.3 ) Fig. 4.11 2. Change the mounting positions of the ventilation panel and air return flange. Ventilation panel Fig. 4.14 Step 6: Motor and drain pump maintenance (the rear ventilated panel is used as an example) Motor maintenance: Air return flange Fig. 4.12 1. Take off the ventilated panel. 2. Take off the blower housing. 3. Take off the motor. 3. When installing the filter mesh, fit it into the flange as illustrated in the following figure. Mofor Blower housing Ventilated panel Fig. 4.15 Fig. 4.13 NOTE: All the figures in this manual are for demonstration purposes only. The air conditioner you have purchased may be slightly different in design, though similar in shape. Pump maintainance: 1. Remove four screws from the drain pump. 2. Unplug the pump power supply and water level switch cable. 3. Detach the pump. Pump Page 12 Fig. 4.16
5 Outdoor Unit Installation Outdoor Unit Installation Instructions The area must be free of combustible gases and chemicals. The pipe length between the outdoor and indoor unit may not exceed the maximum allowable pipe length. If possible, DO NOT install the unit where it is exposed to direct sunlight. If possible, make sure the unit is located far away from your neighbors property so that the noise from the unit will not disturb them. If the location is exposed to strong winds (for example: near a seaside), the unit must be placed against the wall to shelter it from the wind. If necessary, use an awning. (See Fig. 5.1 & 5.2) Install the indoor and outdoor units, cables and wires at least 1 meter from televisions or radios to prevent static or image distortion. Depending on the radio waves, a 1 meter distance may not be enough to eliminate all interference. Strong wind Strong wind Strong wind Fig. 5.1 Fig. 5.2 Step 2: Install outdoor unit. Fix the outdoor unit with anchor bolts (M10) >60cm / 23.6 Fix with bolts Be sure to remove any obstacles that may block air circulation. Make sure you refer to Length Specifications to ensure there is enough room for installation and maintenance. Fig. 5.3 Page 13 Installation Step 1: Select installation location. The outdoor unit should be installed in the location that meets the following requirements: Place the outdoor unit as close to the indoor unit as possible. Ensure that there is enough room for installation and maintenance. The air inlet and outlet must not be obstructed or exposed to strong wind. Ensure the location of the unit will not be subject to snowdrifts, accumulation of leaves or other seasonal debris. If possible, provide an awning for the unit. Ensure the awning does not obstruct airflow. The installation area must be dry and well ventilated. There must be enough room to install the connecting pipes and cables and to access them for maintenance.
Split Type Outdoor Unit (Refer to Fig 5.4, 5.5, 5.6, 5.10 and Table 5.1) Vertical Discharge Type Outdoor Unit (Refer to Fig 5.7, 5.8, 5.9 and Table 5.2) (Wall or obstacle) Air Outlet H >152.4cm / 60 Fig. 5.4 Outdoor Unit Outdoor Unit Installation W W Fig. 5.7 H W H Fig. 5.5 D Fig. 5.8 A D (Wall or obstacle) B Fig. 5.6 >45.7cm / 18 Table 5.1: Length Specifications of Split Type Outdoor Unit (unit: mm/inch) Outdoor Unit Dimensions WxHxD Mounting Dimensions Distance A >45.7cm / 18 >45.7cm / 18 Air inlet Air inlet Distance B 760x590x285 (29.9x23.2x11.2) 530 (20.85) 290 (11.4) 810x558x310 (31.9x22x12.2) 549 (21.6) 325 (12.8) 845x700x320 (33.27x27.5x12.6) 560 (22) 335 (13.2) 900x860x315 (35.4x33.85x12.4) 590 (23.2) 333 (13.1) 945x810x395 (37.2x31.9x15.55) 640 (25.2) 405 (15.95) 990x965x345 (38.98x38x13.58) 624 (24.58) 366 (14.4) 938x1369x392 (36.93x53.9x15.43) 634 (24.96) 404 (15.9) 900x1170x350 (35.4x46x13.8) 590 (23.2) 378 (14.88) MODEL 800x554x333 (31.5x21.8x13.1) 514 (20.24) 340 (13.39) 18 554/21.8 845x702x363 (33.27x27.6x14.3) 540 (21.26) 350 (13.8) 24 36 946x810x420 (37.24x31.9x16.53) 673 (26.5) 403 (15.87) 946x810x410 (37.24x31.9x16.14) 673 (26.5) 403 (15.87) 952x1333x410 (37.5x52.5x16.14) 634 (24.96) 404 (15.9) 952x1333x415 (37.5x52.5x16.34) 634 (24.96) 404 (15.9) Page 14 Air inlet Air inlet >45.7cm / 18 Fig. 5.9 Table 5.2: Length Specifications of Vertical Discharge Outdoor Unit (unit: mm/inch) DIMENSIONS W H D 633/25 554/21.8 554/21.8 633/25 554/21.8 554/21.8 759/29.8 554/21.8 36 600/23.6 633/25 600/23.6 48 710/28 759/29.8 710/28 60 710/28 843/33 710/28
2. Insert the drain joint into the hole in the base pan of the unit. 30 cm / 11.8 m 0c f 1.8 /1 rom ck ba ll wa 3 on le ft M 60 cm / 23.6 P m 0c 3. Rotate the drain joint 90 until it clicks in place facing the front of the unit. 4. Connect a drain hose extension (not included) to the drain joint to redirect water from the unit during heating mode. If the drain joint doesn t come with a rubber seal (see Fig. 5.12 - B ), do the following: Insert the drain joint into the hole in the base pan of the unit. The drain joint will click in place. Connect a drain hose extension (not included) to the drain joint to redirect water from the unit during heating mode. 8 /7 20 in on ri ght t ron f NOTE: Make sure the water drains to a safe location where it will not cause water damage or a slipping hazard. N Fig. 5.10 Rows of series installation Table 5.3 The relations between H, A and L are as follows. L L H A L 1/2H 1/2H < L H Base pan hole of outdoor unit 25 cm / 9.8 or more Seal 30 cm / 11.8 or more Seal Can not be installed L>H Drain joint (A) L A 25 c or m / mo 9.8 re m 0c 30 25 c or m / 9 mo.8 re H ore rm o 18 /1 3.6 /2 m ore c 60 r m o 9 /5 m 0 c more 5 1 r o Fig. 5.11 Drain Joint InstallationFig. 5.11 If the drain joint comes with a rubber seal (see Fig. 5.12 - A ), do the following: 1. Fit the rubber seal on the end of the drain joint that will connect to the outdoor unit. Fig. 5.12 (B) Notes On Drilling Hole In Wall You must drill a hole in the wall for the refrigerant piping, and the signal cable that will connect the indoor and outdoor units. 1. Determine the location of the wall hole based on the location of the outdoor unit. 2. Using a 65-mm (2.5 ) core drill, drill a hole in the wall. NOTE: When drilling the wall hole, make sure to avoid wires, plumbing, and other sensitive components. 3. Place the protective wall cuff in the hole. This protects the edges of the hole and will help seal it when you finish the installation process. Page 15 Outdoor Unit Installation 60 cm / 23.6 above NOTE: The minimum distance between the outdoor unit and walls described in the installation guide does not apply to airtight rooms. Be sure to keep the unit unobstructed in at least two of the three directions (M, N, P) (See Fig. 5.10)
6 Drainpipe Installation The drainpipe is used to drain water away from the unit. Improper installation may cause unit and property damage. Insulate all piping to prevent condensation, which could lead to water damage. If the drainpipe is bent or installed incorrectly, water may leak and cause a water-level switch malfunction. In HEAT mode, the outdoor unit will discharge water. Ensure that the drain hose is placed in an appropriate area to avoid water damage and slippage. DO NOT pull the drainpipe forcefully. This could disconnect it. Drainpipe installation for units with a pump Ceiling <20cm (7.9 ) Indoor Drainpipe Installation Install the drainpipe as illustrated in Figure 6.2. 1. Cover the drainpipe with heat insulation to prevent condensation and leakage. 2. Attach the mouth of the drain hose to the unit s outlet pipe. Sheath the mouth of the hose and clip it firmly with a pipe clasp. (Fig 6.1) 1-1 1-1.5m (39-59 ) Lean over 1/50 <55cm (21.7 ) Drainpipe Installation NOTE ON PURCHASING PIPES This installation requires a polyethylene tube (outside diameter = 3.7-3.9cm, inside diameter = 3.2cm), which can be obtained at your local hardware store or dealer. NOTE ON DRAINPIPE INSTALLATION When using an extended drainpipe, tighten the indoor connection with an additional protection tube. This prevents it from pulling loose. The drainpipe should slope downward at a gradient of at least 1/100 to prevent water from flowing back into the air conditioner. To prevent the pipe from sagging, space hanging wires every 1-1.5m (39-59 ). If the outlet of the drainpipe is higher than the body s pump joint, use a lift pipe for the indoor unit s exhaust outlet. The lift pipe must be installed no higher than 55cm (21.7 ) from the ceiling board. The distance between the unit and the lift pipe must be less than 20cm (7.9 ). Incorrect installation could cause water to flow back into the unit and flood. To prevent air bubbles, keep the drain hose level or slightly tiled up (<75mm / 3 ). 0-75mm (3 ) Drain hose Fig. 6.3 NOTE: When connecting multiple drainpipes, install the pipes as illustrated in Fig 6.4. Drainpipe connecting port Pipe clasp Ceiling Insulation Fig. 6.1 0-53cm (20.8 ) 1-1 1-1.5m (39-59 ) 10cm (4 ) Lean over 1/50 Fig. 6.2 Page 16 Fig. 6.4
3. Using a 65-mm (2.5 ) core drill, drill a hole in the wall. Make sure that the hole is drilled at a slight downward angle, so that the outdoor end of the hole is lower than the indoor end by about 12mm (0.5 ). This will ensure proper water drainage (See Fig. 6.5). Place the protective wall cuff in the hole. This protects the edges of the hole and will help seal it once you finish installation. Units with a pump. 1. Remove the test cover. Fill the water pan with 2 liters of water. Wall Outdoor Indoor Drainpipe Installation 12mm / 0.5 inch NOTE: The drainpipe outlet should be at least 5cm (1.9 ) above the ground. If it touches the ground, the unit may become blocked and malfunction. If you discharge the water directly into a sewer, make sure that the drain has a U or S pipe to catch odors that might otherwise come back into the house. Drainage test Check whether the drainpipe is unhindered. This test should be performed on newly built houses before the ceiling is paved. Units without a pump. CLOSED Test cap CLOSED OPEN N OPE Fig. 6.5 NOTE: When drilling the hole, make sure to avoid wires, plumbing, and other sensitive components. 4. Pass the drain hose through the wall hole. Make sure the water drains to a safe location where it will not cause water damage or a slipping hazard. Fig.6.7 Stow tube Fig.6.8 2. Turn on the unit in COOLING mode. You will hear the drain pump.check whether the water is discharged properly (a 1-minute lag is possible, depending on the length of the drain pipe), Check whether water leaks from the joints. 3. Turn off the air conditioner and put the cap back on. Fig.6.6 Fill the water pan with 2 liters of water. Check that the drainpipe is unhindered. Stow tube Page 17
7 Refrigerant Piping Connection Safety Precautions Notes On Pipe Length and Elevation WARNING Refrigerant Piping Connection All field piping must be completed by a licensed technician and must comply with the local and national regulations. When the air conditioner is installed in a small room, measures must be taken to prevent the refrigerant concentration in the room from exceeding the safety limit in the event of refrigerant leakage. If the refrigerant leaks and its concentration exceeds its proper limit, hazards due to lack of oxygen may result. When installing the refrigeration system, ensure that air, dust, moisture or foreign substances do not enter the refrigerant circuit. Contamination in the system may cause poor operating capacity, high pressure in the refrigeration cycle, explosion or injury. Ventilate the area immediately if there is refrigerant leakage during the installation. Leaked refrigerant gas is both toxic and flammable. Ensure there is no refrigerant leakage after completing the installation work. Ensure that the length of the refrigerant pipe, the number of bends, and the drop height between the indoor and outdoor units meets the requirements shown in Table 7.1: Table 7.1: The Maximum Length And Drop Height Based on Models. (Unit: m/ft.) Type of model North America, Australia and the eu frequency conversion Split Type Other Split Type Capacity (Btu/h) Length of piping Maximum drop height <15K 25/82 10/32.8 15K - <24K 30/98.4 20/65.6 24K - <36K 50/164 25/82 36K - 60K 65/213 30/98.4 12K 15/49 8/26 18K-24K 25/82 15/49 30K-36K 30/98.4 20/65.6 42K-60K 50/164 30/98.4 Refrigerant Piping with Twin Indoor Units When installing multiple indoor units with a single outdoor unit, ensure that the length of the refrigerant pipe and the drop height between the indoor and outdoor units meet the requirements illustrated in the following diagram: Outdoor unit The drop height between indoor unit and outdoor unit must be less than or equal to 20m (65.6 ) H2 L1 L Indoor unit H1 The line branch pipe L2 Indoor unit Fig. 7.1 Page 18 The drop height between two indoor units must be less than or equal to 50cm (19.6 )
Oil traps If the indoor unit is installed higher than the outdoor unit: -If oil flows back into the outdoor unit s compressor, this might cause liquid compression or deterioration of oil return. Oil traps in the rising gas piping can prevent this. An oil trap should be installed every 10m (32.8ft) of vertical suction line riser. (See Fig. 7.2) If the outdoor unit is installed higher than the indoor unit: -It is recommended that vertical suction risers not be upsized. Proper oil return to the compressor should be maintained with suction gas velocity. If velocities drop below7.62m/s (1500fpm (feet per minute)), oil return will be decreased. An oil trap should be installed every 6m(20ft) of vertical suction line riser. (See Fig. 7.3) Refrigerant Piping Connection Fig. 7.2 The indoor unit is installed higher than the outdoor unit Fig. 7.3 The outdoor unit is installed higher than the indoor unit Page 19
Table 7.2 Permitted length Total piping length 18K+18K 30/98 24K+24K 50/164 L+Max (L1, L2) 30K+30K Piping length Drop height (farthest distance from the line pipe branch) 15/49 L1, L2 (farthest distance from the line pipe branch) 10/32.8 L1-L2 Drop height between indoor and outdoor unit 20/65.6 H1 Drop height between two indoor units 0.5/1.6 H2 DO NOT deform pipe while cutting. Be extra careful not to damage, dent, or deform the pipe while cutting. This will drastically reduce the heating efficiency of the unit. 1. Make sure that the pipe is cut at a perfect 90 angle. Refer to Fig. 7.4 for examples of bad cuts 90 Oblique Rough Warped Size of joint pipes for indoor unit Table 7.3 Size of joint pipes for 410A indoor unit Capacity of indoor unit (A) 18K Size of main pipe(mm) Refrigerant Piping Connection Fig. 7.4 Step2: Remove burrs. CE-FQZHN-01C Φ12.7(0.5 ) Φ6.35(0.25 ) Burrs can affect the air-tight seal of refrigerant CE-FQZHN-01C piping connection. They must be completely Φ15.9(0.626 ) Φ9.5(0.375 ) 24K removed. CE-FQZHN-01C Φ15.9(0.626 ) Φ9.5(0.375 ) 30K 1. Hold the pipe at a downward angle to prevent burrs from falling into the pipe. Size of joint pipes for outdoor unit 2. Using a reamer or deburring tool, remove Base on the following tables, select the diameters all burrs from the cut section of the pipe. of the outdoor unit connective pipes. In case of the Pipe main accessory pipe large than the main pipe, take Reamer the large one for the selection. Table 7.4 Size of joint pipes for 410A outdoor unit Point down the size of main pipe(mm) Model Gas side Liquid side The 1st branching pipe Φ15.9(0.626 ) Φ9.5(0.375 ) CE-FQZHN-01C 36K Φ15.9(0.626 ) Φ9.5(0.375 ) CE-FQZHN-01C 48K Fig. 7.5 Φ15.9(0.626 ) Φ9.5(0.375 ) CE-FQZHN-01C 60K Step 3: Flare pipe ends Gas side Liquid side Available branching pipe Refrigerant Piping Connection Instructions The branching pipe must be installed horizontally. An angle of more than 10 may cause malfunction. DO NOT install the connecting pipe until both indoor and outdoor units have been installed. Insulate both the gas and liquid piping to prevent water leakage. Step1: Cut pipes When preparing refrigerant pipes, take extra care to cut and flare them properly. This will ensure efficient operation and minimize the need for future maintenance. 1. Measure the distance between the indoor and outdoor units. 2. Using a pipe cutter, cut the pipe a little longer than the measured distance. Page 20 Proper flaring is essential to achieve an airtight seal. 1. After removing burrs from cut pipe, seal the ends with PVC tape to prevent foreign materials from entering the pipe. 2. Sheath the pipe with insulating material. 3. Place flare nuts on both ends of pipe. Make sure they are facing in the right direction, because you can t put them on or change their direction after flaring. See Fig. 7.6 Flare nut Copper pipe Fig. 7.6 4. Remove PVC tape from ends of pipe when ready to perform flaring work.
5. Clamp flare form on the end of the pipe. The end of the pipe must extend beyond the flare form. Flare form NOTE: Use both a spanner and a torque wrench when connecting or disconnecting pipes to/from the unit. Fig. 7.10 Pipe Fig. 7.7 6. Place flaring tool onto the form. 7. Turn the handle of the flaring tool clockwise until the pipe is fully flared. Flare the pipe in accordance with the dimensions shown in Ensure to wrap insulation around the piping. table 7.5. Direct contact with the bare piping may result in burns or frostbite. Table 7.5: PIPING EXTENSION BEYOND FLARE FORM Make sure the pipe is properly connected. Pipe Tightening Flare dimension (A) Flare shape Over tightening may damage the bell mouth torque (Unit: mm/inch) gauge and under tightening may lead to leakage. Min. Max. 18-20 N.m (183-204 kgf.cm) 8.4/0.33 8.7/0.34 Ø 9.5 25-26 N.m (255-265 kgf.cm) 13.2/0.52 13.5/0.53 Ø 12.7 35-36 N.m (357-367 kgf.cm) 16.2/0.64 16.5/0.65 Ø 15.9 45-47 N.m (459-480 kgf.cm) 19.2/0.76 19.7/0.78 Ø 19.1 65-67 N.m (663-683 kgf.cm) 23.2/0.91 23.7/0.93 Ø 22 75-85N.m (765-867 kgf.cm) 26.4/1.04 26.9/1.06 90 ± 4 45 ±2 A R0.4~0.8 Bend the pipe with thumb Fig. 7.8 8. Remove the flaring tool and flare form, then inspect the end of the pipe for cracks and even flaring. Step 4: Connect pipes Connect the copper pipes to the indoor unit first, then connect it to the outdoor unit. You should first connect the low-pressure pipe, then the high-pressure pipe. 1. When connecting the flare nuts, apply a thin coat of refrigeration oil to the flared ends of the pipes. 2. Align the center of the two pipes that you will connect. Indoor unit tubing Flare nut NOTE ON MINIMUM BEND RADIUS Carefully bend the tubing in the middle according to the diagram below. DO NOT bend the tubing more than 90 or more than 3 times. Pipe Fig. 7.9 3. Tighten the flare nut as tightly as possible by hand. 4. Using a spanner, grip the nut on the unit tubing. 5. While firmly gripping the nut, use a torque wrench to tighten the flare nut according to the torque values in table 7.5. min-radius 10cm (3.9 ) Fig. 7.11 6. After connecting the copper pipes to the indoor unit, wrap the power cable, signal cable and the piping together with binding tape. NOTE: DO NOT intertwine signal cable with other wires. While bundling these items together, do not intertwine or cross the signal cable with any other wiring. 7. Thread this pipeline through the wall and connect it to the outdoor unit. 8. Insulate all the piping, including the valves of the outdoor unit. 9. Open the stop valves of the outdoor unit to start the flow of the refrigerant between the indoor and outdoor unit. Check to make sure there is no refrigerant leak after completing the installation work. If there is a refrigerant leak, ventilate the area immediately and evacuate the system (refer to the Air Evacuation section of this manual). Page 21 Refrigerant Piping Connection Ø 6.4
8 Wiring Safety Precautions WARNING Wiring Disconnect the power supply before working on the unit. All wiring must be performed according to local and national regulations. Wiring must be done by a qualified technician. Improper connections may cause electrical malfunction, injury, or fire. An i ndependent circuit and single outlet must be used for this unit. DO NOT plug another appliance or charger into the same outlet. If the cannot handle the load or there is a defect in the wiring, it can lead to shock, fire, and unit and property damage. Connect the power cable to the terminals and fasten it with a clamp. An insecure connection may cause fire. Make sure that all wiring is done correctly and the control board cover is properly installed. Failure to do so can cause overheating at the connection points, fire, and electrical shock. Ensure that main power supply connection is made through a switch that disconnects all poles, with contact gap of at least 3mm (0.118 ). DO NOT modify the length of the power cord or use an extension cord. Connect the outdoor wires before connecting the indoor wires. Make sure you ground the unit. The grounding wire should be located away from gas pipes, water pipes, lightning rods, telephone wires or other grounding wires. Improper grounding may cause electrical shock. DO NOT connect the unit to the power source until all wiring and piping is completed. Make sure that you do not cross your electrical wiring with your signal wiring. This may cause distortion and interference. Page 22 To prevent distortion when the compressor starts (you can find the unit s power information on the rating sticker): The unit must be connected to the main outlet. Normally, the power supply must have a impedance of 32 ohms. No other equipment should be connected to the same power circuit. TAKE NOTE OF FUSE SPECIFICATIONS The air conditioner s printed circuit board(pcb) is designed with a fuse that provides overcurrent protection. The specifications of the fuse are printed on the circuit board, such as: Indoor unit: T5A/250VAC, T10A/250VAC. (applicable for unit adopts R32 refrigerant) Outdoor unit: T20A/250VAC(for <24000Btu/h unit), T30A/250VAC(for >24000Btu/h unit) NOTE: The fuse is made of ceramic. Outdoor Unit Wiring WARNING Before performing any electrical or wiring work, turn off the main power to the system. 1. Prepare the cable for connection a. You must first choose the right cable size. Be sure to use H07RN-F cables. Table 8.1: Minimum Cross-Sectional Area of Power and Signal Cables in North America Rated Current of Appliance (A) 7 7-13 13-18 18-25 25-30 AWG 18 16 14 12 10
Table 8.2: Other World Regions Rated Current of Nominal Cross-Sectional Appliance (A) Area (mm²) 6 0.75 6-10 10-16 16-25 25-32 32-45 1 1.5 2.5 4 6 b. Using wire strippers, strip the rubber jacket from both ends of the signal cable to reveal approximately 15cm (5.9 ) of wire. c. Strip the insulation from the ends. d. Using a wire crimper, crimp u-lugs on the ends. NOTE: When connecting the wires, strictly follow the wiring diagram found inside the electrical box cover. 2. Remove the electric cover of the outdoor unit. If there is no cover on the outdoor unit, take off the bolts from the maintenance board and remove the protection board. (See Fig. 8.1 and 8.2). Indoor Unit Wiring 1. Prepare the cable for connection. a. Using wire strippers, strip the rubber jacket from both ends of the signal cable to reveal about 15cm (5.9 ) of the wire. b. Strip the insulation from the ends of the wires. c. Using a wire crimper, crimp the u-lugs to the ends of the wires. 2. Remove the cover of the electric control box on your indoor unit. 3. Connect the u-lugs to the terminals. Match the wire colors/labels with the labels on the terminal block. Frmly screw the u-lug of each wire to its corresponding terminal. Refer to the Serial Number and Wiring Diagram located on the cover of the electric control box. Control box Wiring Cover Screw Fig. 8.1 Connective wiring diagram Wiring diagram Fig. 8.3 Protection Board Magnetic ring(if supplied and packed with the accessories) 1 2 3 Fig. 8.2 3. Connect the u-lugs to the terminals Match the wire colors/labels with the labels on the terminal block. Firmly screw the u-lug of each wire to its corresponding terminal. 4. Clamp down the cable with the cable clamp. 5. Insulate unused wires with electrical tape.keep them away from any electrical or metal parts. Pass the belt through the hole of the Magnetic ring to fix it on the cable Fig. 8.4 6. Reinstall the cover of the electric control box. Page 23
While connecting the wires, please strictly follow the wiring diagram. The refrigerant circuit can become very hot. Keep the interconnection cable away from the copper tube. - Press CONFIRM. The air conditioning unit will then start the fan for airflow automatic adjustment. ON will flash during when the fan is on during automatic airflow adjustment. 4. Clamp down the cable with the cable clamp. The cable must not be loose or pull on the u-lugs. 5. Reinstall the electric box cover. Using the wire controller to set external static pressure (some models) You can use the unit s automatic airflow adjustment function to set external static pressure. After 3 to 6 minutes, the air conditioning unit stops operating once automatic airflow adjustment has finished. Automatic airflow adjustment is the volume of blow-off air that has been automatically adjusted to the quantity rated. 1. Make sure the test run is done with a dry coil. If the coil is not dry, run the unit for 2 hours in FAN ONLY mode to dry the coil. Wiring 2. Check that both power supply wiring and duct installation have been completed Check that any closing dampers are open. Check that the air filter is properly attached to the air suction side passage of the unit. 3. If there is more than one air inlet and outlet, adjust the dampers so that the airflow rate of each air inlet and outlet conforms with the designed airflow rate. Make sure the unit is in FAN ONLY mode. Press and set the airflow adjustment button on the remote control to change the airflow rate from H or L. 4. Set the parameters for automatic airflow adjustment. When the air conditioning unit is off, perform the follwoing steps: - Press COPY. - Press + or - to select the AF. Page 24 DO NOT adjust the dampers when automatic airflow adjustment is active. If there is no change after airflow adjustment in the ventilation paths, be sure to reset automatic airflow adjustment. If there is no change to ventilation paths after airflow adjustment,contact your dealer, especially if this occurs after testing the outdoor unit or if the unit has been moved to a different location. Do not use automatic airflow adjustment with remote control,if you are using booster fans, outdoor air processing unit, or a HRV via duct. If the ventilation paths have been changed, reset airflow automatic adjustment as described from step 3 onwards.
Power Specifications NOTE: Electric auxiliary heating type circuit breaker/fuse need to add more than 10 A. Indoor Power Supply Specifications MODEL(Btu/h) POWER 18K PHASE VOLT 25/20 32/25 50/40 70/55 70/60 CIRCUIT BREAKER/ FUSE(A) 36K MODEL(Btu/h) POWER 19K~24K 25K~36K 37K~48K 49K~60K 37K~60K 36K 37K~60K PHASE 3 Phase 3 Phase 3 Phase 3 Phase VOLT 380-420V 380-420V 25/20 32/25 32/25 45/35 CIRCUIT BREAKER/FUSE(A) Outdoor Power Supply Specifications MODEL(Btu/h) POWER 18K VOLT 25/20 32/25 50/40 70/55 70/60 36K MODEL(Btu/h) 37K~60K 36K 37K~60K PHASE 3 Phase 3 Phase 3 Phase 3 Phase VOLT 380-420V 380-420V 25/20 32/25 32/25 45/35 CIRCUIT BREAKER/FUSE(A) Independent Power Supply Specifications MODEL(Btu/h) POWER (indoor) PHASE VOLT CIRCUIT BREAKER/ FUSE(A) PHASE POWER (outdoor) VOLT CIRCUIT BREAKER/ FUSE(A) 18K 19K~24K 25K~36K 37K~48K 49K~60K 15/10 15/10 15/10 15/10 15/10 25/20 32/25 50/40 70/55 70/60 Page 25 Wiring PHASE CIRCUIT BREAKER/ FUSE(A) POWER 19K~24K 25K~36K 37K~48K 49K~60K
36K 37K~60K 36K 37K~60K PHASE VOLT MODEL(Btu/h) POWER (indoor) CIRCUIT BREAKER/FUSE(A) PHASE POWER (outdoor) VOLT 15/10 3 Phase 15/10 3 Phase 15/10 3 Phase 15/10 3 Phase 380-420V 380-420V CIRCUIT BREAKER/FUSE(A) 25/20 32/25 32/25 45/35 Inverter Type A/C Power Specifications 18K MODEL(Btu/h) POWER (indoor) PHASE VOLT CIRCUIT BREAKER/ FUSE(A) PHASE POWER (outdoor) VOLT 220-240V 220-240V 220-240V 220-240V 220-240V 15/10 15/10 15/10 15/10 15/10 CIRCUIT BREAKER/ FUSE(A) 25/20 25/20 40/30 50/40 50/40 36K 37K~60K 36K 37K~60K PHASE VOLT 220-240V 220-240V 220-240V 220-240V MODEL(Btu/h) Wiring POWER (indoor) 19K~24K 25K~36K 37K~48K 49K~60K 15/10 3 Phase 15/10 3 Phase 15/10 3 Phase 15/10 3 Phase 380-420V 380-420V CIRCUIT BREAKER/FUSE(A) 25/20 32/25 32/25 40/30 Page 26 Air CIRCUIT BREAKER/FUSE(A) PHASE POWER (outdoor) VOLT
9 Air Evacuation Safety Precautions Use a vacuum pump with a gauge reading lower than -0.1MPa and an air discharge capacity above 40L/min. The outdoor unit does not need vacuuming. DO NOT open the outdoor unit s gas and liquid stop valves. Ensure that the Compound Meter reads -0.1MPa or below after 2 hours. If after three hours the gauge reading is still above -0.1MPa, check if there is a gas leak or water inside the pipe. If there is no leak, perform another evacuation for 1 or 2 hours. DO NOT use refrigerant gas to evacuate the system. 4. Turn on the vacuum pump to evacuate the system. 5. Run the vacuum for at least 15 minutes, or until the Compound Meter reads -76cmHG (-1x105Pa). 6. Close the manifold gauge s Low Pressure valve and turn off the vacuum pump. 7. Wait for 5 minutes, then check that there has been no change in system pressure. NOTE: If there is no change in system pressure, unscrew the cap from the packed valve (high pressure valve). If there is a change in system pressure, there may be a gas leak. 8. Insert hexagonal wrench into the packed valve (high pressure valve) and open the valve by turning the wrench in a 1/4 counterclockwise turn. Listen for gas to exit the system, then close the valve after 5 seconds. Evacuation Instructions Flare nut Before using a manifold gauge and a vacuum pump, read their operation manuals to make sure you know how to use them properly. Manifold Gauge Compound gauge Pressure gauge Cap Air Evacuation Valve body -76cmHg Valve stem High pressure valve Low pressure valve Charge hose Charge hose Vacuum pump Low pressure valve Fig. 9.1 1. Connect the manifold gauge s charge hose to the service port on the outdoor unit s low pressure valve. 2. Connect the manifold gauge s charge hose from the to the vacuum pump. 3. Open the Low Pressure side of the manifold gauge. Keep the High Pressure side closed. Fig. 9.2 9. Watch the Pressure Gauge for one minute to make sure that there is no change in pressure. It should read slightly higher than the atmospheric pressure. 10. Remove the charge hose from the service port. 11. Using hexagonal wrench, fully open both the high pressure and low pressure valves. OPEN VALVE STEMS GENTLY When opening valve stems, turn the hexagonal wrench until it hits against the stopper. DO NOT try to force the valve to open further. 12. Tighten valve caps by hand, then tighten it using the proper tool. Page 27
Note On Adding Refrigerant Refrigerant charging must be performed after wiring, vacuuming, and the leak testing. DO NOT exceed the maximum allowable quantity of refrigerant or overcharge the system. Doing so can damage the unit or impact it s functioning. Charging with unsuitable substances may cause explosions or accidents. Ensure that the appropriate refrigerant is used. Refrigerant containers must be opened slowly. Always use protective gear when charging the system. DO NOT mix refrigerants types. For the R290 or R32 refrigerant model, make sure the condtions within the area have been made safe by control of flammable material when the refrigerant added into air conditioner. The maximum refrigerant charge amount of R32 is 305 grams. Some systems require additional charging depending on pipe lengths. The standard pipe length varies according to local regulations. For example, in North America, the standard pipe length is 7.5m (25 ) In other areas, the standard pipe length is 5m (16 ). The additional refrigerant to be charged can be calculated using the following formula: Liquid Side Diameter Air Evacuation φ6.35(1/4 ) φ9.52(3/8 ) φ12.7(1/2 ) R22 (orifice tube in the indoor unit): (Total pipe length standard pipe length)x 30g (0.32oZ)/m(ft) (Total pipe length standard pipe length)x 65g(0.69oZ)/m(ft) (Total pipe length standard pipe length)x 115g(1.23oZ)/m(ft) R22 (orifice tube in the outdoor unit): (Total pipe length standard pipe length) x15g(0.16oz)/m(ft) (Total pipe length standard pipe length) x30(0.32oz)/m(ft) (Total pipe length standard pipe length) x60g(0.64oz)/m(ft) R410A: (orifice tube in the indoor unit): (Total pipe length standard pipe length) x30g(0.32oz)/m(ft) (Total pipe length standard pipe length) x65g(0.69oz)/m(ft) (Total pipe length standard pipe length) x115g(1.23oz)/m(ft) R410A: (orifice tube in the outdoor unit): (Total pipe length standard pipe length) x15g(0.16oz)/m(ft) (Total pipe length standard pipe length) x30g(0.32oz)/m(ft) (Total pipe length standard pipe length) x65g(0.69oz)/m(ft) (Total pipe length standard pipe length)x 12g(0.13oZ)/m(ft) (Total pipe length standard pipe length)x 24g(0.26oZ)/m(ft) (Total pipe length standard pipe length)x 40g(0.42oZ)/m(ft) R32 : Page 28
Test Run Before Test Run A test run must be performed after the entire system has been completely installed. Confirm the following points before performing the test: a) Indoor and outdoor units are properly installed. b) Piping and wiring are properly connected. c) No obstacles near the inlet and outlet of the unit that might cause poor performance or product malfunction. d) Refrigeration system does not leak. e) Drainage system is unimpeded and draining to a safe location. f) Heating insulation is properly installed. g) Grounding wires are properly connected. h) Length of the piping and the added refrigerant stow capacity have been recorded. i) Power voltage is the correct voltage for the air conditioner. Failure to perform the test run may result in unit damage, property damage, or personal injury. Test Run Instructions f. Check to see that the drainage system is unimpeded and draining smoothly. g. Ensure there is no vibration or abnormal noise during operation. 5. For the Outdoor Unit a. Check to see if the refrigeration system is leaking. b. Make sure there is no vibration or abnormal noise during operation. c. Ensure the wind, noise, and water generated by the unit do not disturb your neighbors or pose a safety hazard. 6. Drainage Test a. Ensure the drainpipe flows smoothly. New buildings should perform this test before finishing the ceiling. b. Remove the test cover. Add 2,000ml of water to the tank through the attached tube. c. Turn on the main power switch and run the air conditioner in COOL mode. d. Listen to the sound of the drain pump to see if it makes any unusual noises. e. Check to see that the water is discharged. It may take up to one minute before the unit begins to drain depending on the drainpipe. f. Make sure that there are no leaks in any of the piping. g. Stop the air conditioner. Turn off the main power switch and reinstall the test cover. NOTE: If the unit malfunctions or does not operate according to your expectations, please refer to the Troubleshooting section of the Owner s Manual before calling customer service. Page 29 Test Run 1. Open both the liquid and gas stop valves. 2. Turn on the main power switch and allow the unit to warm up. 3. Set the air conditioner to COOL mode. 4. For the Indoor Unit a. Ensure the remote control and its buttons work properly. b. Ensure the louvers move properly and can be changed using the remote control. c. Double check to see if the room temperature is being registered correctly. d. Ensure the indicators on the remote control and the display panel on the indoor unit work properly. e. Ensure the manual buttons on the indoor unit works properly. 10